Full, Overlay+, or Overlay?

Full: Textures everything from vanilla Minecraft items to Skyblock mod assets.

Overlay+^† (Overlay for v1.4.1 and newer):
Textures Skyblock items and various skull helmets.^††

Overlay (for v1.2.6 and older): Textures Skyblock items only.

Furf's Mediafire link: all past FurfSky+ versions.

Any further questions?

Check the FAQ page for answers.

† Only applicable for pack versions between v1.3 to v1.4, inclusive.

†† The NotEnoughUpdates mod by Moulberry is required to apply custom skull helmet textures.
(Custom pet textures only requires OptiFine.)